Sudden aggression in an older, gentle dog is frequently linked to osteoarthritis, dental pain, or vision loss.

Animal owners can benefit from understanding animal behavior and its relationship to veterinary science, by:

Each rule-out includes suggested diagnostics (e.g., "House-soiling + increased thirst → check glucose, T4, urine specific gravity").

Advanced compulsive disorders that interfere with an animal's daily functioning. Behavior and Welfare in Agriculture and Captive Settings